On a SnapServer 500, 600 and 700 Series model, the slots for the Power Supplies are not marked and may make it confusing to identify which Power Supply is PS1 in the server until one of them is showing as failed in the web interface and displays the blinking green pattern on the Power Supply LED itself. However, if that pattern is not showing on either Power Supply and both the web interface and the system log are telling one that it has failed, which one is PS1 and which one is PS2?<br /><br />The one on the right when looking at the back of the server, or the one closest to the edge of the Chassis, is PS1. When this server is manufactured, there is only one Power Supply in that chassis and that is where it gets installed for a server with a single Power Supply. When a second Power Supply is added, it is added in the slot farthest away from the edge for that module.<br /><br />The other way to look at this is by using the Ethernet Ports on the back as a guide. These are numbered from left-to-right with the Primary being "1" and the Secondary being "2". The numbering of the Power Supplies is in the opposite direction (from right-to-left) with PS1 being on the right and PS2 being on the left.